US1396988A - Fuse - Google Patents

Description

1. H. BRADNACK.

FUSE.

APPLICATION FILED FEB. 19, l9l9 1396,9238. Patented Nov. 15, 1921.

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JOHN H. BRADNACK, OF NEW HAVEN, CONNECTZGUT.

Specification of Letters Patent.

FUSE.

Patented Nov.15, 1921.

Application filed February 19, 1919. Serial No. 278,042.

- ,To w from it may concern Be it known that I, JOHN H. BKADNACK, a citigen of the United States. residing at New Haven, hr the county of New Haven and State of Connecticut, have invented a new andiuseful Improvement in F uses; and I do hereby declare the following, when taken in connectionwith the accompanying drawings ,andthe;;cliaracters of reference marked thereon,-to,be a. full, clear, and exact descrip- .tion.,o'f the-.same, and which said drawings constitute part. of this application, and represent,;-in.---

Figure 1a side view of a fuse constructed in accordance with my invention. 2:7: 2-:a'n end'view of the same.

Fig. 3 a sectional view on the line 3-3 of Fig-.-;1;r

Fig. 4- an end view with the cap removed. Fig: Swan enlarged transverse sectional viewiofv one end of the fuse.

Fig. 6 a sectional view on the line 66 of of Fig.5..

Fig. 7 a side view of one form of cap used in connection with my fuse and shown 1n connection with one of the fuse bars. I

Fig. 8 a side view illustrating a modified form of cap and clip.

Fig. 9v a top or plan view of the same. Fig. 10 a transverse sectional view lllustrating a modified form of collar.

Fig. 11 an end view of a fuse illustrating another means for securing the bars in the collars.

This invention relates to an improvement in fuses for electric installation, and particularly to fuses of the so called cartridge type, that is, a fuse which consists of a tubular casing of paper or other suitable fibrous material, with caps applied to the ends thereof, and means for supporting a fuse within the tube 'so that contacts may be made at opposite ends thereof, the objectof the invention being to produce a fuse at a low cost for manufacture by which a fuse strip may be readily replaced as required, and thefuse inspected, if necessary; and the invention consists in the construction hereinafter described and particularly recited in the claims.

In carrying out my invention, I employ a tube 12 of paper or other fibrous material. Applied to opposite ends of this tube are col lars 13 and 14 formed from metal and connected with the ends of the tube in any desired manner, either by spinning the edge of the collars into the tube as shown in Fig. 3

of the drawings, or by threading the collars and turning them onto the tube as indicated in Fig. 10 of the drawings. In each of the collars is a transverse bar 15. These bars may be secured in any desired manner. Thus as shown in Figs. 3 and 5 of the drawings the collarsv may be formed on opposite sides with vertical grooves 16 in which the ends of the bars extend, the bars resting upon the. ends of the tube on which they may be held by turningthe opposite edges of the collars inward. Preferably and as shown the bars are formed with inward extensions 18. The usual fuse strips 19 are inserted into the tubes and the ends folded over the bars. The ends of the fuse are closed by caps 20 provided with inwardly extending spring fin gers 21 which are adapted to pass on opposite sides of the bar so as to firmly hold the fuse strip in connection therewith. These clips will preferably be formed as shown in Fig. 7 of the drawings so as to provide spring clips with upwardly extending fingers 22, although single finger clips may be employed as shownin Fig. 8 of the drawings, in which the clip is formed from a strip of metal folded to form two gripping fingers. 23, these fingers being secured to the cap plate 20 by means of a clip 24. Preferably and as shown in Fig. 2, the cap plates will be formed on opposite sides with lips 27 which extend into the finger openings formed by turning in the edges in the collars. Instead of turning the opposite edges of the collars inward, the. opposite edges may be formed with notches 28 as shown in Fig. 10 0f the drawings, the object of the turned in portions and notches being to provide clearance for the fingers in removing the clips, and the bars may extend at right angles to the notches or so as to intersect the notches as indicated in Fig. 11 of the drawings; and instead of having the ends of the bars extend into grooves in the collars, the ends 26 of the bars may be bent in opposite directions and secured in the collars by soldering or other wise. If desired, and as indicated in Fig. 6, the ends of the casingmm ifi be slotted to receive the lower edges oi tie. bars which prevent the collars from turning. lVith this construction, as stated, the ends of the fuse maybe readily folded over the ends of the bars so as to electrically connectthe same and the caps inserted to close the ends of the. tube, the fingers of theelips holding the fuse in close contact with the bars and mak- Y ing electrical connection between the two caps. Should it be desired to inspect the fuse one of the caps may be readily removed, and in case the fuse is broken, a portion of the fuse will be removed with the cap being gripped by the clip so that if a portion of the fuse comes out with the clip, it indicates at once that the fuse is broken. On the other hand, if the cap is removed without bringing a portion of the fuse with it, it indicates that the fuse is intact. These caps or clips are readily removed with the fingers and do not require the application of any tool to them for that purpose.

I claim 1. A fuse comprising a tube, collars permanently secured to opposite ends of the tube, bars extending transversely to said collars, and caps closing the ends of the tubes and formed with inwardly projecting clips adapted to straddle the said bars.

2. A fuse comprising a tube having its ends slotted on opposite sides, collars permanently secured to opposite ends of the tube, bars extending transversely to said collars and adapted to enter the slots in the tube, and caps closing the ends of the tubes and formed with inwardly projecting clips adapted to straddle the-said bars.

3. A fuse comprising a tubular casing, collars secured to opposite ends thereof, said collars formed on opposite sides with finger openings, transverse bars in said collars, caps adapted to close the ends of the fuse, said cap provided with inwardly projecting spring fingers adapted to straddle said bars.

collars secured to opposite ends thereof, said collars formed on opposite sides with finger openings, transverse bars in said collars, caps adapted to close the ends of the fuse, said cap provided With inwardly projecting spring fingers adapted to straddle said bars, and with lips on opposite sides extending into said finger openings.

5. A fuse comprising a tubular casing, collars connected with opposite ends of the casing, said collars formed with vertical grooves, transverse bars in said collars the ends ofwhich enter said grooves, caps adapted to close the ends of the fuse and pro vided with inwardly projecting spring fin gers adapted to straddle the said bars.

6. A fuse comprising a tubular casing, collars permanently connected with the 0pposite ends of the casing beyond which they project, opposite outer edges of the collars struck inward, a transverse bar connected with said collars, caps adapted to close the ends of said fuse and provided with inwardly projecting spring fingers adapted to straddle said bars.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

- JOHN H. BRADNACK. Witnesses FREDERIC (l. EARLE, CLARA L. WEED.

4. A fuse comprising a tubular casing,.

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